Synology High Availability SHA User Guide for DSM 7.1
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... series 12 series Supported models FS6400, FS3600, FS3400, FS3017, FS2500, FS2017, FS1018 SA3600, SA3400 DS3622xs+, DS2422+ RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+ RS820RP+, RS820+, DS1520+, DS920+, DS720+, DS620slim, DS420+, DS220+ RS1619xs+, RS1219+, DS2419+II, DS2419+, DS1819+, DS1019+ RS3618xs, RS2818RP+, RS2418RP+, RS2418+, RS818RP+, RS818+, DS3018xs, DS1618+, DS918+, DS718...
... series 12 series Supported models FS6400, FS3600, FS3400, FS3017, FS2500, FS2017, FS1018 SA3600, SA3400 DS3622xs+, DS2422+ RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+ RS820RP+, RS820+, DS1520+, DS920+, DS720+, DS620slim, DS420+, DS220+ RS1619xs+, RS1219+, DS2419+II, DS2419+, DS1819+, DS1019+ RS3618xs, RS2818RP+, RS2418RP+, RS2418+, RS818RP+, RS818+, DS3018xs, DS1618+, DS918+, DS718...
Synology High Availability SHA User Guide for DSM 7.0
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... series 12 series Supported models FS6400, FS3600, FS3400, FS3017, FS2500, FS2017, FS1018 SA3600, SA3400 DS3622xs+, DS2422+ RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+ RS820RP+, RS820+, DS1520+, DS920+, DS720+, DS620slim, DS420+, DS220+ RS1619xs+, RS1219+, DS2419+II, DS2419+, DS1819+, DS1019+ RS3618xs, RS2818RP+, RS2418RP+, RS2418+, RS818RP+, RS818+, DS3018xs, DS1618+, DS918+, DS718...
... series 12 series Supported models FS6400, FS3600, FS3400, FS3017, FS2500, FS2017, FS1018 SA3600, SA3400 DS3622xs+, DS2422+ RS4021xs+, RS3621xs+, RS3621RPxs, RS2821RP+, RS2421RP+, RS2421+, RS1221RP+, RS1221+, DS1821+, DS1621xs+, DS1621+ RS820RP+, RS820+, DS1520+, DS920+, DS720+, DS620slim, DS420+, DS220+ RS1619xs+, RS1219+, DS2419+II, DS2419+, DS1819+, DS1019+ RS3618xs, RS2818RP+, RS2418RP+, RS2418+, RS818RP+, RS818+, DS3018xs, DS1618+, DS918+, DS718...